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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46e5208302ae619b2e5605b22f78260e2955daa89bba3e4e6b838d2a7ba0f72' 
  AND token = 'wbKMZz0GiDiHHyTTz7/DNZGbv9LD8emnaimz3fe6QT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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