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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1078988c79afd0a409f6590c82c9518acd0db4e43b4ae1cdcb1a579d38dc75d5' 
  AND token = 'bTAmMnvcGAuxM895sd4DkD5RCTb1UEBRFr/aY7F/+Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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