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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea22f60539f234d0d62ce9bbbba3b85eeae7a9e7336ffc340ef4a55631468bd' 
  AND token = 'W87DahRjNIbEXJyeC2T7I6qJgKt5WIzi2PGLoKBRJJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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