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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9facdc1fdff014f80c348957154e25f11af0cf1ff8b2374cb9ca17793d0332f9' 
  AND token = '8OrEa61NYvy1u7QfT2rWXzL/ievB87ud1IFKBvexrM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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