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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786bd40d52dded072bf45b2afc7f481ee6b384509273ede8c926f46d4f1e913e' 
  AND token = '87sAVN+ZwoClUH8UxyVvcFaBqSxCE49xUuAWvukKnxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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