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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fa561c639bbe8214fe132cbe6c695f14f59726fb95773951a5aedb31472e14' 
  AND token = 'yjHWT7klVeIECDoBjPjkTMYd7YDJUwySLRGdXWP1uD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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