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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed6bfb3d932c47c428ddcf696f7094762a752ca8aabae9e1e6507cf35d2a605' 
  AND token = 'bu5NcDl9ui2P/4Lc1amct9I7oEnaw/bcLKA5wy/P2uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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