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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f70891965e16340345a46ee337cd4c660e96c1d49d8e4df4733199f4907934c' 
  AND token = 'n76dw3VRyNurpHDITZTni4gEXIYriDvJMSRn/iJWHW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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