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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fbdb63ee5bf3308ca70100221cb9ab063bfd3b28d5ec6c1066ddc41006b83b' 
  AND token = 'xUvP1St0QVESdt/zCo6uutfXvf81WuuF2ZtkEzLbwgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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