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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b8e1d0630193ec38c7cd9e769c1038d648c0c30b80cef7f91bfb9ea6eeb8f7' 
  AND token = 'YEuoHF31jmsMukJDWbyT/dkuuxb+ITiSCvzHlmELv/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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