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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc1385191c895ea832d8df008ec17f3fecd959d43a22d0b406af3e08143ed0c' 
  AND token = 'Q7nnVftXNiAJkLtlD4+XE57kXZICjZ/VsLwqipetk9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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