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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32cef9523b8b768bb92b007e04718a76147a46cab637c05166e80413b425788' 
  AND token = 'jFQV305DxQMogR3PNCUIKe/HbyNsOYojSHpunldhmw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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