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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e5f6c9bdb2c9d50aabf4b92b5a7c742b5041a323e0c8a168557413d7ffa69c' 
  AND token = 'Ys+1ZG3ggSayml4/o7NvOXR67Fpk3RHilSCvTkDUvcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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