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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5536c6909f858901d142e89327f52f0cb614ec7e9b6853eb4065e86108ec25f5' 
  AND token = 'lNysZ2d2JHejqGuJ9q0q9T4es3dxnIwQGvaFPsa81nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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