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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c785f835536303687247084298fea6252f7d1592e885d72a195bdd95094abe79' 
  AND token = 'snZrjIT0Al0SUu3dXCqLjLfGSfcmbC579vgJZlXTz1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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