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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f60d690dbe4012f0665a9d6ba73e38417979c5c52bde91c496a0b323b2545f' 
  AND token = 'N5mc0+1etl1g5cJ8KTXKq9+aWP/spj9PfECY4MFs+QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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