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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528524882da87d767d70c73bdeafbc3f5a45937fb43a21c7f78c6f0fadadf224' 
  AND token = 'dc5rmhRxYZJm3xav/eQAo8vStA0/b6F9g+23lHBwWJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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