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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275e27578fd22287745c8158b7ec74a75392f56e090ab7c3614d35ff5553966e' 
  AND token = 'Lm0+NuHNo8i0KOTv5Hu8nQ9Sj1TqBpqtxkXV8A65y7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}