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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829de2bcf8eeb49cc26fc4cd9eb6a570877362272f9df1ed238a0174a4b07db8' 
  AND token = '5JddPcs7n/XuN+NLesgb9yr35YIX6Dk0xSdDZlr1s0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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