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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bce0accd413e98bdcd8cf257a94dacc9460cf0607b078cadb87d1c68b9ef4d' 
  AND token = '7pzxj3imJLJrNy1g1KDhlCYwS25xikjtBDfNqWTXZVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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