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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7539e7d4dd65cc5b4c8cd6ff9ea2c801aab99e56591fa83bdf5a8a8f4914ac1' 
  AND token = 'U71wK72pbZW2jFVZoW03W3JcNPXq97yodNIMXkDNk0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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