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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2466c19ab1181b997c1fb7d435638b15c3b85959ca992b27121fde07b4aadc63' 
  AND token = 'kpacrn5CbxFI6OBjSvYoWBHuDEGsf9l0xiVEb6PYjJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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