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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87302260f72f2330029531892367a99ae6318ca4c1d82538828ba5998aae89e6' 
  AND token = 'Ukn9FyRwiGwokIebidy5T97B/78K2GXbzVVQpEJIaPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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