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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc8bd387ef73a5f7174e5661ca1a9a3e05e820ee96e5afcaeaefe7c8120f969' 
  AND token = 'tnZkV3LUN3LCOTTlmETwZx/8HO2zMBortTtlDMmikfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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