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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6b120a6a8d12508149e340bb61a95ec52513b68408ade98894c51540a7956d' 
  AND token = 'qUChFTpR6sTlwe0qvDLewA2HhS+s+uRkO/D57k5jEmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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