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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa611bc1a751495d13ea6d705fbfc95ab155063f93f2e64aa67c93d9f3b1f4a3' 
  AND token = 'zhuJXAaf40puX9Gb5ZeVkwkm8lwZSpawaViX6l3Ag9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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