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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5703b7909e5cd538d60d813d41aa5c0680e3a9adcba7290a2c7bf1ce3678a121' 
  AND token = 'f3xkTPNjtzH9I4v0g9cfAwpVy6Ih0odM9zOX2t23WKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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