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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca28c20042286a17872b51f1c59f0ab5b2d111ded18d81b93b3a960a43d61e1' 
  AND token = 'aC/ctmRi3wTukYQygZxRwHcS4qYsNOOZ8eTomn2ydD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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