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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093df46057802f5f1fcc1188f6b0bf283c97256a439ec3eeb53ac02db8e3fcb9' 
  AND token = '0iRpm+0xnoL/3m50QyeI8IprNWVkd9+bOqOFWxP0X5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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