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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01d0daa1a847381598dd4c94e2e9e6b42f986d1c78cb7e6f7bf83283c20db13' 
  AND token = 'pk2Q9ZsICXuxbEgfVqPozTh5zQ2E5q8XRD66s5YnQTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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