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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763bf7eaab2517b09bd62cdb089e818950b1e26bffb121e9b52cab62dd4a7985' 
  AND token = 'ii7ox8eqgKbEGv+yEny8rMRFZQ2W1Z6fFu3A2SKZvPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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