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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e83a6092dc1791b971015773eed5a8417b7a6be8a5d565e97688ae3b769620b' 
  AND token = '77q5TwY5lrnd8gs58iumn6+1MDQ+kjb+S1AQpTW9Q5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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