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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cb3bd27373f1dcfaea8ae89a9154448beef77ee28d37a5c4c8e6df0a00c85e' 
  AND token = '6JtxIXSYfnZjvUJuw+7tpHjPe/Rm8l3jTbjP8jMaxXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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