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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064a58445e0a5b133a455ac94c2d92d22dd49ed47326c1a4af6d89f041f4daeb' 
  AND token = '3NCrraIG7ZKNsDsT2se/jFXxppxJAafGobUltQiyi/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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