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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4f02d3c805ce74a9fc886f49216ada57f5e3de34221c94ab8eaae5ac32c3eb' 
  AND token = '1JJ2qydev9XMERwErMIM6Z7HVpPWvvDZV2+2i6fj3cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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