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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b81a874672ce1b2cb7d5eb816891c567cb89d924ddf169f19e519dc2e5a1eb7' 
  AND token = 'SoC3pnRMHhd2e+wDaRISB2tWNHBdQgImIdJVpoGPg+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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