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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e98b53287a1a2b7b145dea22b7a26ec1056543ed6b728ef4a5fc68b0394fc2' 
  AND token = 'Etah5dZHyvRKa3ppKyh0JB5SqUMGsCle0Mohk8jbT30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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