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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84793f13c5da9381f3ed8dd82add24297ebcc7807bbd8fb120104c0219f26423' 
  AND token = 'NziXliGvnDcOFSth1A7Sef3sT/+y9jpwsrJ0A1JAy6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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