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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abe672cd4ebd3e9c1e88645d6a790a8ca41adb38ba6f4102b66331f3448a403' 
  AND token = 'lJdqirCb8JvESB+gNKDqcomNPW5K6uwKnShPE859hb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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