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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5d4686c11fc05cd8758c6b623787021a34ab737865da8687240415e3629783' 
  AND token = 'MGowXuZ8MOAstGQo/2vysSWjX9bG4o+ojK65NqC6nYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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