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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b6443ce74bc8ba089aceab9021e7165e049d2617926cf6b224e4b690836e75' 
  AND token = 'iV8oo7Z2Vep6QTCllH1As/ZX3k7KodOlPx8o9gF+wLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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