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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df341bf747f46cc5525d856dc8c2cba6dbb7b7e4c719ba3192e3ff2b37bc010' 
  AND token = 'x/R92VL4A/0wWe3JRizQ4APP7nswapiSNmdV7kJXHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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