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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92312347fc7de7f9e15cc18a51c4c4dcdfcee0aa8c61319fc98fc12e0dfaecac' 
  AND token = 'GOMHr2ieDm1leOMoT5QO/Of5WgXde/nQkhybJKfM984=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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