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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02014be43ac8282e53d2736f87e6e11a23526e8e10a89b399a4a170e7858e601' 
  AND token = 'AZZl2PY96alNWFfF+UFtZdNf+SCJks/OoqUzS9Waltg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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