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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802d2db124d7e8e8fad03faa6be7d67dcda7583981c8868d6cec305746729ac6' 
  AND token = 'b8MfLUVG4zUAvoTmxbXtCuce350dtKqhcyliGLb3+Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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