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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94483399aa202f24a948bed3d378a4b7e7e9caf0ada45855f86b784b0cfdcf92' 
  AND token = 'I06khegslBgsEtT/zEjuWtLQm0eneritkUnx+oB/CMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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