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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d23ac5f222eaf9984812e30cdd24ea4d325c148fddcc91d5056f3acb4f4118' 
  AND token = '3s30X7kjYkH1S9ZB7jLh/SOM33H0QAjX3d1D1Qz8e9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00141

JSON explain

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