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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f7289afda8a6b712de909c6c94fc199a6fd275bd2c3360cf8d9c53ec0c9fd7' 
  AND token = '4X8R9IzZnyn0DjWT77Fhlnu/pz30erNmQqzA//gU4tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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