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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f211cf8843eb2c9ccaf2b2fff035f91dfb91ef156e407ce60edb310269cbb7bf' 
  AND token = 'LQ1eUmVM/EHrcOGug3NHQAyHpv8L6eshKO5QDUnz74o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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