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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0d540f432c0e4db7ffaff8ff2453fcfafc137834d24d81c1e2f4fa9735790c' 
  AND token = 'QPg9WcyHR7P05q1cqG7aXpEP3SneeqXFjU9PuzPFR0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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