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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa12b0101173a4483f65309cf1f02e3a272976df18ef6eab3a61005c62ac445' 
  AND token = 'mh4iWMPp3sSbtQhqBxIK98s9odw7dIq7nlif6ORNAzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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