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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9615e4fa90d7370b1134d1529d8ba7d4c533aa1497d12af064fb34fca4ccee4d' 
  AND token = '9Gv3L9V0buofXkjS8gr2AY7TAzkdYTuf6V6Pq77JGTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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