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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52d2956f85ecc069cec1bc18d37245761fa7f504ff1e69dae4e3b8e5fc38d5a' 
  AND token = 'oxLEMgor698zNvs2d2zdSlYwNDoqTMHDVkG8E2CN95Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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