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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7184aa5fa294bbf43fca963d7695afe1d9d04d5f1f8d97a6f06c9b8e38fbb2' 
  AND token = 'FJphNPzaxwNT96Fr+rKMcAvPd/Aoplz+LpsAVEZaS8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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