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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc047870622c35e9b9ead0e841e51df5267994d816edd1a02c88db5c6053ebef' 
  AND token = '5LC+qcks4K+6FwLsV31N37KyleG+OO2wPMbL4i9TPTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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