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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9c7d31941a92ff33230431169bcf7ce90b64fa40ea282712ed6e15f300c40c' 
  AND token = 'dZ67HwHIXk4PS8bj1clYCw6ujc8WQZdbBQ3++vrxlKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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