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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18eda8de74e92c663a2520d4de08d92a17316673bfe1651f49f131da1ebbde13' 
  AND token = '/9NSBdqr3/IR/FRMhqhxc62GrVVeJWuUlFp+yegsQpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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