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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff32b3dbc7fc7f1201d9809958f08fda7a9319a2adf4862502bacfbcb01fcc41' 
  AND token = 'aqA5AON4xnJhgb9iJrf0dJ3aQNn1fsO3/DUu8b9IIOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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