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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b5c613954b764e2df3c4398546b707a5bfd5037c0908baec3ad33201cfaa59' 
  AND token = '1TuELsyJl+a0Gn2CJQUu8CqAcYxPGwbU1XTn7YWzDEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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