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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba8700f808351e832e99b6786e983e00c06f1a8da3a61270a66f700834e3dc0' 
  AND token = 'crh+3QqC/dJ5kCMe0KKOgKOgoUt2gevQ/a1liX8C558=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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