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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65fec7b080afc6c75d831892892f3f8e4cab2319d750ab5876bcf0e01515cdb' 
  AND token = '/cRbnE1ha0h+ooo5sAgihJi74UAqN7Ye1eDxLhorp0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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