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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3107e615243159ceac0a75ca7d596c90877b93d8fd6e58987d8cc87b97c39c86' 
  AND token = 'Q0Pqkc4pM4UdYsOzeg+6w+VTf1W08clGtjQ6flcOn3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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