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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c201e743a1f56ab148956db658cbc7d0dba53282585c718110e4913f9e5f52' 
  AND token = 'yYUU+yFsONVbdLdH8siF3Wnsrgj7AflhFb3XHCLDF9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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